* States of matter: The key difference lies in the states of matter. Water is a liquid, and gases are, well, gases. Liquids have molecules that are closer together than gas molecules. Gas molecules are much further apart and move freely, taking up much more space.
* Volume and density: It's better to compare volume at a specific mass. A given mass of water will have a smaller volume than the same mass of air (a gas) because the water molecules are packed much more densely. Think of it like this: imagine a room full of people standing close together (liquid) versus a room full of people spread out far apart (gas).
* Temperature and pressure: The volume of a gas is also heavily influenced by temperature and pressure. A gas expands when heated and contracts when cooled. It also compresses when pressure increases.
In conclusion: It's not about the substance itself, but about the state of matter and its relationship to density, temperature, and pressure.
